<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }

      body {
        padding: 100px;
      }

      textarea {
        width: 200px;
        height: 100px;
        border: 1px solid pink;
        outline: none;
        resize: none;
      }

      ul {
        margin-top: 50px;
      }

      li {
        width: 300px;
        padding: 5px;
        background-color: rgb(245, 209, 243);
        color: red;
        font-size: 14px;
        margin: 15px 0;
      }

      li a {
        float: right;
      }
    </style>
  </head>

  <body>
    <textarea name="" id=""></textarea>
    <button>发布</button>
    <ul></ul>
    <script>
      // 1. 获取元素
      var btn = document.querySelector("button");
      var text = document.querySelector("textarea");
      var ul = document.querySelector("ul");
      // 2. 注册事件
      btn.onclick = function () {
        if (text.value.trim().length == "") {
          alert("输入有误");
        } else {
          var li = document.createElement("li");
          li.innerHTML = `${text.value} <a href='javascript:;' >删除</a>`;
          ul.appendChild(li);
          var as = document.querySelectorAll("a");
          for (var i = 0; i < as.length; i++) {
            as[i].onclick = function () {
              this.parentNode.remove();
            };
          }
        }
        text.value = "";
      };
    </script>
  </body>
</html>
